Flow and segregation in sheared granular slurries

We study the behaviour of a granular slurry, i.e., a very concentrated suspension of heavy (denser than the fluid) and polydisperse particles sheared between two parallel-plane circular disks. For small gaps, the slurry behaves as a 2d system with a characteristic radial size segregation of particle...

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Bibliographic Details
Published in:Europhysics letters 2004-04, Vol.66 (1), p.139-145
Main Authors: Barentin, C, Azanza, E, Pouligny, B
Format: Article
Language:English
Subjects:
64.75.+g
83.80.Hj
83.85.Ei
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Summary:We study the behaviour of a granular slurry, i.e., a very concentrated suspension of heavy (denser than the fluid) and polydisperse particles sheared between two parallel-plane circular disks. For small gaps, the slurry behaves as a 2d system with a characteristic radial size segregation of particles. For large gaps, the slurry responds as a 3d system, with considerable vertical segregation and a concomitant 2-phase (fluid, solid) flow structure. The thickness ζ of the fluid phase is the 2d-3d gap crossover. Surprisingly, ζ is found to be nearly unaffected by very large changes in the particle size distribution.
ISSN:0295-5075
1286-4854
DOI:10.1209/epl/i2003-10191-2